When Andy is attacked, he smashes into a shelving unit and falls in front of it. When Piper and Phoebe check on him he is several feet away from it.
At the very end of the episode Phoebe is talking to Piper in the kitchen. Her hair is up in a bun. Then a few seconds later the two of them walk out to see Pru on the front porch and Phoebe's hair is suddenly down with two clips in it.
After Rodriguez destroys a window and clock, he can be heard walking over broken glass, though the window and clock are now undamaged.
In the kitchen, Piper's necklace is a cross, but when she goes outside, it's a butterfly.
The first time that Phoebe is killed, her right hand is bent out, but the next time she is shown, her head is laying on it, then it is bent out again.
The last time the demon attacks the sisters, Prue is lying unconscious on the floor. Phoebe asks Piper if Prue is okay. Piper replies: "Yeah, she's out cold", but her lips say: 'Yeah, she's okay."
When Rodriguez hits Andy with an energy ball and he flies across the room, his stunt double can be clearly seen.
Phoebe tells Prue that Andy had to have been killed by a demon in order for him to be thrown across the room the way he was. However, her premonition didn't show him being thrown across the room, just laying on the floor dead.