Charmed

In episode Death Become Them Piper wanted to cancel Chris's first birthday much to Leo's dismay because Zankou wanted to kill the family. She said "he is only one, he won't be remember" and Leo replies "we will" Here, Leo uses the same expression although he says that "Wyatt is not three yet and he won't remember Halloween".

Dogan's extended fingertips seem to not be the same color as his real skin - they appear fake.

In previous episodes, vanquishing potions are shown only to explode when they hit the demon they were made for. If they miss their target, they simply spill onto the floor. In this episode, however, a potion is shown exploding when it hits a wall.

During this episode Billie never mentions that it's strange seeing the real Charmed Ones. Tecnically Billie knew the characters of the three cousins, she didn't see the real appearance of the Charmed Ones. So why did Billie ever say something about the new look of the sisters?

When Paige shows the reporters around the Manor, she takes them to the attic and mentions that their Grams' sewing machine is broken. This could be refering to the episode Look Who's Barking, when Piper blew it up by accident.

TRIVIA: This episode features a spell to erase painful memories - "After this cruel memory is seen and said, erase these thoughts from my heart and my head."

Paige says to the journalists that they are the third generation to own the Manor. The three generations she's referring to are themselves, Penny & Allen and as mentioned in the season 2 episode Pardon My Past, the Manor already belonged to Penny's parents (although their family name isn't Halliwell, but Baxter for the mother and Johnson for the father). While upon hearing this one may get confused and think the show was mistaken and it was four generations it was not! Patty died when the girls were very young and therefore never inherited the house causing ownership to go from Grams to the girls.

TRIVIA: In this episode Piper's costume is a mouse, Paige's is an angel, and baby Chris is a wizard.

TRIVIA: This is the 2nd marriage and divorce for Phoebe; the first being to Cole Turner who was a demon posing as a lawyer.

TRIVIA: This is the second time Halloween is celebrated, the first time being in the season three episode: "All Halliwell's Eve".

When Leo and Piper are having their spat in the bedroom after Leo's fight at Wyatt's preschool, the bruise on his cheek seems to disappear.