If someone wants to nitpick about it (and I say this in jest), the line he quotes in this movie is incorrect. Dreyfuss actually said, "This is no boat accident." He did not say (as Emilio says), "This is no boatING accident." So no wonder he didn't know, it's not the exact line! Just joking around...
I watched Jaws again on the new DVD then watched Stakeout later and made the connection.
Well, it was from 20 years before, plus how many films has he done since then? Also, he did have drug problems in the 80's so that could've hurt his memory.
Drug problems in the 80s? How about in the 90s when his Lexus "jumped a curb" (quoting the L.A. Times) in Studio City? I've never seen a jumping Lexus.