In the first scene in the sports bar, pieces of popcorn thrown at Fran & Val appear and disappear from their hair in between frames.
Mike wears #7 for the New York Rangers, but that number was retired in 1979 for Rod Gilbert.
When the players gather close to the boards in front of Fran, Maxwell, and Brighton, it's clear that the players are wearing roller blades.
When Fran tosses the handheld mirror over her shoulder, it makes a shattering sound, but we can clearly see, in the background, that it never broke when it hit the floor.