When Tom is talking to Walt, who is in the pool, about flying down to Mexico, the amount of white sunscreen on Walt's lower lip changes between shots.
Alice tells Tom her dog died on a Saturday. However, the headstone for Ceasar notes the date of death as April 1, 1966, which was a Friday.
Sgt. Valens mistakenly uses Code 9 to mean a "stakeout". The correct one is Code 5.