When the warlock comes from the future to talk to Cole, Cole has a beard. Later when Cole goes and talks to Piper in the kitchen, he's shaved. When Cole later goes to talk to Phoebe at Mile's apartment, his beard is back again.
Phoebe and Miles make plans to meet for lunch, and say they will meet at Miles' work. Despite this plan, Miles leaves work, and when Phoebe saves him, she says she wanted to surprise him for lunch. This doesn't make sense as they had lunch plans.
The character Phoebe is seen wearing a pair of dark stiletto boots when she gets out of the car in front of Miles's office. Then when she is running down the street, she's in a pair of light brown UGG boots. In the next shot, she is suddenly wearing dark stiletto boots again.
Original goof: "When Piper goes back in time and talks to her past self, past Piper says she can't be from too far in the future because she just bought the top her future self is wearing. This makes no sense, as a shirt just being bought doesn't dictate how far in the future it can be worn" Piper is just being sarcastic, because at the beginning, she thinks the other piper is a fake, and not herself from the future.
When Phoebe is originally saving Miles in the alley, the "frozen" guy visibly releases his grip on the gun for Phoebe to take it from him.