There is a Scream (1996) poster in Paige's bedroom. Rose McGowan, who plays Paige in Charmed, played Tatum Riley in Scream.
Darryl's assignment board (visible when he yells at Cole about how busy he is) is made up of file folders sitting in their holders. Most, if not all, have "file numbers" on them. One of the "file numbers" in one of the bottom two rows is 8675309, which also happens to be "Jenny"'s phone number in the famous song by that name.
In the 2006 season 4 dvd box set the posters in Paiges room have been blurred out.
Teenage Paige has bangs and braces, like all the Halliwell sisters.
When teenage Paige and her parents leave school after the principal suspends Paige, the outside of the school seems to be the same high school as the one on 7th Heaven. It has the same long set of stairs and grassy hill. Both shows aired on the same network, the WB.