In a real university, Porky's professor would be in serious trouble with the university's ethics committee for failing to confirm that Daffy was a qualified substitute. Porky would likely be expelled for failing to report the matter to university administration, and for accepting the promise of an A for keeping quiet.
When Lola offers Bugs her pearl-encrusted gloves, the pearls are repeatedly seen to sparkle brightly. Pearls are iridescent, but they do not sparkle brightly the way a diamond or sapphire sparkles.