The front windows of the hardware store are higher than the door on the outside, but they are slightly lower than the door on the inside.
While Peter and Nick are walking through the liquor store, the same background passes by twice.
When riding the cable car the outside view shows only chairlifts on the same cable and no other cable cars.
When Lisa is giving Peter his phone when he's receiving a text from James after their first date, it is clearly already unlocked and can be seen with an opened messaging app, even though she just picked it up.
The movie is set in New Hampshire but Peter visit's "Eastbridge Wine & Liquor". All wine and liquor in NH are strictly sold by the state-run New Hampshire Liquor and Wine Outlet.