When Piper is sitting on the bed, at the end of the episode, the window in the nursery hasn't been put in yet. Also the blue screen is visible through the window.
TRIVIA: Guest star, Amanda Sickler, the girl that gave the lunch to Paige in this episode is the same one that will work with Phoebe in the future as her assistant.
When Phoebe, as a mermaid, goes down into the water, she opens her mouth to catch enough air to stay under water. But as a mermaid, shouldn't she be able to breath underwater?
Piper says exactly the same thing in a dangerous moment. She says to Necron "You are not demon enough to kill me" the same way that she says it in the episode "My three witches" before the car explosion.
GOOF: When Phoebe is signing the divorce papers, we see her first name already written as she's signing and it's misspelled: "Pheobe".
TRIVIA: The song playing at the end of the episode is B*Witched's Blame it On the Weatherman.
TRIVIA: This is the second time that Patty has come to assist one of her children while they're drowning. The first time was in the season 1 episode From Fear to Eternity when Prue is dropped in a pool by Barbas.
What happened to Phoebe's clothes? She was wearing clothes when she was turned into a mermaid, but when she changed back, she was naked and Cole covered her in his jacket. Does she just lose those clothes?
Leo kept sensing that Piper was hurt, so why didn't he go and heal her and vanquish the demon later?
TRIVIA: Piper's unborn baby shows its first magical power, the ability to heal Piper from the womb.
Cole: You need psychological help.
Paige: Okay, that's probably true—especially because I cannot believe what I am about to say—but I think Phoebe's still in love with you.
Cole: Oh, yeah. "Phoebe hates you so much her body erupted in scales." That's what you said this morning.
Paige: Okay, maybe an unfortunate choice of words...
Darryl and Cole are discussing Phoebe.
Darryl: Let's pretend for a second here, just for the sake of argument, that you saved my butt because you are my friend. So as your hypothetical friend, can I give you some advice?
Darryl: Don't do this to yourself.
Cole: I can't help it.
Darryl: You love her, I get it. And your love, it's epic. Okay. But look what it's doing to you.
Cole: Paige says she hates me. She says I should leave for good. You've known her for a long time, Darryl, what do you think? Should I leave?
Darryl: I know you don't want to. But what you want really doesn't matter,
Darryl: Well, there you go.
Piper: It's my job to take care of this family.
Leo: Sometimes it's this family's job to take care of you.
Paige: Hey, no touch. I don't want you or my unborn niece around that. You shouldn't be inhaling all this smoke when you're pregnant, anyway.
Piper: Ah, Paige, you're such a worry wart.
Piper's potion blows up in the attic.
Paige: What are you mixing up here anyway?
Piper: Oh, a little burdock root and some eye of newt.
Paige: What? You're never, ever supposed to mix those two things together. That is a volatile combination...You know, you ought to be more careful.
Piper: Hey, a good plan violently executed this week is better than a perfect plan executed next week. That's Patton.
Paige: Why are you quoting Patton?
Patty: Piper. I know why you've been afraid. You don't want to leave your baby the way I left you. But spells won't make that fear go away. Only faith will. Have faith that your destiny is different than mine. Take my hand.
Nancy O'Dell: Gosh, I am so sorry. Your sister said we were doing the interview in the bathroom.
Phoebe: Well that should have been your first clue that my sister sprang from the shallower end of the gene pool.
Piper: Oh, come on Phoebe. You wanted fame, go ahead and grab it. Carpe diem.
Phoebe: Don't mention carp around me please.
Piper: I am doing you a favor. People will think you're bold and daring. What's better then a celebrity who wants to do an interview in the nude.
Piper: Locked in
Full of fear
My panic grows manic till I can't hear
In need of reprieve so that I can breathe
Remove my fear
Please make it leave.
Paige (handing Phoebe a glass of water): Here's your water.
Phoebe (Taking a sip): Ugh, it could use a little salt.
Paige (talking to Cole about Phoebe): She's a mermaid. Her body erupted in scales. She had to turn into a fish to get away from you, do ya get it now?
Paige: Oh yeah, you don't know.
Piper: I don't know what?
Paige: Well, I didn't wanna make you mad, you getting so panicky and all.
Piper: Yes we've established. I was a spineless coward in the face of evil, now what don't I know?
Phoebe: Go to hell!
Cole: I was just there.
Piper: (In a sarcastic voice) Oh please somebody help me, the mean demon is dipping my feet in the water and it's really cold!
Cole: I realize that people's reputations precede them, but, contrary to public opinion, I'm not the source of all evil.. anymore.
Phoebe (to Cole): I do love you, and I always will. But it doesn't change anything. It doesn't matter. It's over between us.
Cole: Wait, before you say anything-
Paige: Not to say, do, because I'm about to orb your family jewels far, far away.
Cole: Yeah, that would hurt.
Leo: Sorry I was a medic, not a vet.
Phoebe: You are holding me hostage!
Paige: Yep looks like it.
Phoebe: Look I am not a common goldfish. I cannot ignore the call of the sea!
Paige: Well the call of the common bathtub is just gonna have to do.
Piper: Oh watch out Phoebe, he's packing a seashell.
Piper: Ok...I've had enough. Your treatment of me is shocking.
Craig: What are you?
Phoebe: How do I do that?
Piper: I don't know. Get in touch with your inner fish!
This episode scored 6.3 million viewers.
This episode features the second cameo of guest star Nancy O'Dell after the episode Deja Vu All Over Again.
Title: A Witch's Tail
This is a reference to Shakespeare's play "The Winter's Tale", and a slight reference to the 2001 movie "A Knight's Tale" starring Heath Ledger.