After the power went back on and sometime between there and the third drug, the second drug was already in the IV line, despite the fact that the drug was not even injected yet.
After the first injection, the cloth covering Luis's IV is colored blue. When the second drug is injected, it is clean again.
Right before the power to the prison flickers, the anesthetic in the machine was already depleted and into Luis. However, when the power flickers, there is still shown to be some of the drug in the machine.
Even though this episode picks up immediately after the end of the last one, Sam is conspicuosly absent as Pilar enters.
While it's possible that Sheridan could have easily found the hospital scrubs, it's unlikely she would have been able to get the wig to disguise herself with so quickly.
Even though Ethan didn't arrive in time to stop Theresa from saying 'I do', as a lawyer he would know that the marriage was not legal until she signed the wedding license.
One of Endora's thought balloons (saying 'Yes') was mistakenly shown coming from Tabitha's mind.
While Spike is being spun around in the air in Tabitha's kitchen, his shirt is completely open. After he is released and gets on his feet, two buttons are fastened, when there was absolutely no chance for him to have fastened them himself.
Although never revealed on-air during her run on the show, Rae's last name is finally revealed to be Thomas.
Endora uses her magic to zap the Scissor Sisters (Paddy Boom, Del Marquis, Babydaddy, Ana Matronic, Jake Shears and JJ Garden on keyboards) into the Blue Note, where the two perform their single I Don't Feel Like Dancin'. Another of their songs, She's My Man, is also used during the episode. Endora is often seen during the episode holding their CD, Ta-Dah.
The song playing at the beginning when Julian and Ivy realize they're in bed together is a jazzy version of Silent Night.
The songs Luis played for Fancy in her hospital room were Away in a Manger and Silent Night.
The bar Chad, Luis, and Ethan go to is called Wolf Creek.
Fancy Crane: Luis, I am so impressed. You two won the blue ribbon for the tango. I had no idea Aunt Sheridan was such a good dancer.
Luis Lopez-Fitzgerald: Yeah, she wasn't. I taught her.
This statement contradicts earlier episodes. One of Luis and Sheridan's first major interactions was Pilar's birthday party in the summer of 1999, where the two danced the tango together. Both were extraordinarily good, and Sheridan required no teaching whatsoever from Luis. The two had frequently tangoed over the years, but Sheridan had learned to tango long before she ever met him.
Little Ethan's full name legally changes from Ethan Winthrop Jr. to Ethan Lopez-Fitzgerald Crane now that Alistair has adopted him -- part and parcel of Alistair and Theresa's marriage.
Theresa chastises Whitney for admitting she hates the baby in her belly, telling her how wrong it is. When Theresa was pregnant with Little Ethan, and made no secret of how much she hated the child, and admitted she didn't care for him at all until after he was born.
Chad says, to Valerie that he and Whitney could 'even get married in some states'. This is incorrect. There is not a single state that has legalized the relationship of half-siblings. The closest relations allowed to marry (in some states only) are first cousins.
When Sheridan arrived at her surprise bridal shower, she took off her coat as Tabitha greeted her. But after the commercial break, Sheridan still had her coat on.
In previous scenes there was no pharmacy directly outside Alistair's hospital room until all of a sudden one just appears.