Chomsky was always kinda iffy even back then. Here's a fun writeup on it, but most interesting I find is his misread on the effectiveness of black radicalism during the Vietnam war. There's also his incessant general Lenin bashing, which is mostly irrelevant in the modern day, but more importantly his whitewashing of America as this great free place thanks to freedom of speech (a very liberal conception of it) or Western Europe as socialist.