I have to admit I haven't seen an Abbott and Costello movie in about 20 years. I used to watch 'em all the time on Saturdays and Sundays on such superstations as Ch 11 in New York and Ch 38 in Boston. These are the ones that cling most fondly in memory:

The Time of Their Lives
Who Done It?
The Wistful Widow of Wagon's Gap
Meet Frankenstein
Meet the Killer, Boris Karloff
Meet Captain Kidd
Buck Privates