Charmed

When Cole/The Source beheads one of his guards in the beginning, shouldn't his body have disappeared? If he's a demon (which is most likely considering the boss), he should have magically cleaned himself up.

When the Wizard causes the massage girls to appear, one of them begins massaging his ears. This is called umox, which is a Ferengi massage technique. Armin Shimerman, who plays the Wizard, also played the Ferengi Quark in Star Trek: Deep Space 9, who was very enamoured of that particular form of massage.

A possible continuity error, in the episode Pardon My Past Phoebe's previous incaranation had the power of fire throwing, which Leo says is an upper level demonic power. She was not demonic in her past life and was still considered a witch. After she was killed, Leo said her powers had regressed because she used her powers for evil purposes. If it was a demonic power to start with it wouldn't explain why it regressed and didn't just change when she became good. The use of evil power would have only given her more power and made her even more evil in the next life.

TRIVIA: This is the eighth time that one of the Charmed Ones was turned evil.

When the wizard is waiting in the sun room for the girls, he asks, "What is taking so long?" and turns around three times in the exact same place and in the exact same way, because it was a looped illusion.

TRIVIA: In this episode Phoebe gets a demonic power, fire throwing - the same power that her past life had when she was in love with a warlock (much like present Phoebe with Cole).

TRIVIA: In this episode, the girls discover the truth about Cole - he is the Source.

When Piper picks up a potion to destroy the Grimiore, she throws the potion and misses, and then wonders why it doesn't work!

In the earlier season 4 episode "Saving Private Leo", when Cole is interviewing Julie, his demonic secretary, he asks her what powers she has and she mentions, amongst others, fireballs. However, in this episode she throws energy balls not fireballs.

When Cole, as the Source, beheads the guard in the beginning, the middle of the blade severs the head. When the blade is shown all the blood is up by the handle and is dripping down.

When Phoebe is telling her sisters she is pregnant, you can clearly see and hear that she is wearing white high heeled shoes. Later, when she abruptly leaves for work while talking to Cole, you can still hear the heels of her shoes on the floor, but after she picks up her bag and jacket and moves towards the elevator, you can clearly see she has on some bulky black boots.