Deliberate mistake: Whenever Charlotte and Trey are shown sitting on the therapist's couch, Charlotte is considerably taller than Trey. They are both sitting on exactly the same surface, so there is no logical reason for this. In reality, Trey is actually taller than Charlotte. She should not be sticking up higher than him on the couch.
Continuity mistake: While doing the chicken breast fight, Wade wets Carrie's tanktop slightly, then he leans over the balcony and when we see Carrie again her tanktop is magically wetter. Then she leans over and its drier, but when she enters the house it's soaking wet.
Revealing mistake: When Carrie is scooting through New York, there are literally crowds of people gathering together watching the filming and staring at Carrie and the camera. There's even a big group standing in the middle of the road despite the traffic with a cop in front controlling the situation.
Visible crew/equipment: When Charlotte tells Trey to go to a doctor and she says "What options do we have?", two rectangular bluish lighting screens are reflected on her lenses. Can't be the lamp in front of her because it's vanilla coloured and has a totally different shape.