1) Locate the scene just after Number Five flips over the table with all Stephanie's china on it (after which #5 says: "Numerous fragments. Some large, some small <He's so cute>). This is when Stephanie picks up the remote and turns on the TV.

2) As Stephanie is saying "Right. Input, input" Look at the hand she has streatched out with the remote. See the mirror that her hand is blocking?

3) Watch the scary man offstage shift position in the mirror.

This movie is full of errors. I've loved it since I was little, but it is a very flawed movie. This slip-up is really the only one worth mentioning, however.