From the wikipedia:
"scholars have perceived a gay
subtext suffused through the film, especially a
camp sensibility,
[55] particularly embodied in the character of Pretorius and his relationship with Henry. "
"I think the closest you can come to a homosexual metaphor in his films is to identify that certain sort of camp humor."
[59]
The common reading on Bride of Frankenstein is that it has camp sensibilities. The Abbott and Costello movies are comedies. The two are very different.