Frankie pours Sach (playing Handsome Hal) a glass of booze filling it up to the rim and hands it to him. But in the next close-up shot of Sach, the glass is only three-quarters full.
During the stakeout, Sach takes a hard-boiled egg out of his lunch and puts it in the middle of a dozen flashbulbs. In the next wider shot, most of the flashbulbs have disappeared and the egg is no longer surrounded by them.
Before Sach (playing Handsome Hal) takes a drink in Frankie's office, a small puff of steam appears from behind his left ear. Of course after drinking, the steam starts pouring out in earnest.