When Ralph leaves to go get Ed so they can drink the bottle of wine that was stored in the bedroom closet Alice pours out the wine & fills the bottle up with grape juice from the icebox. But neither Ralph or Ed notices the "wine" they are drinking is cold instead of being warm like it should have been.
When Ralph doesn't bring home the evening paper after work, Alice (looking forward to a puzzle in the paper) says he always brings it home. In no episode does Ralph bring home the evening paper when he comes home from work.
Jackie Gleason slips up twice while preparing the dinner. First he tells Norton to turn the oven all the way up, so the chicken will cook in "twice the time" (he should have said "half the time"). Then, when referring to the rice he tells Norton to use the whole box, "in case it's too much, I won't eat any" (should have said "not enough").
The door is left partially open when Norton leaves but is closes right before Joe Fensterblau knocks on it.