This was the first feature length "Looney Tunes" movie made. The fourth one was actually titled "Bugs Bunny's 3rd Movie", but this is still technically the original. It features various Looney Tunes cartoons which were done in the other movies. I generally don't watch documentaries, but I'll make an exception for this, because it focused on narrative in the Looney Tunes series. Unlike the other films, this one was done with live-action bits between the cartoons. Judging from the title, it's mostly about Bugs Bunny, but does talk about the franchise in general and features about 23 minutes of new material.
The best part might have been hearing how Mel Blanc had to spit out carrots after every take. It is false that he was allergic to them. He just hated them! There's no cartoons after 1949, presumably because that's the year Leon Schlesinger died. Apart from Mel Blanc, he worked on more Looney Tunes cartoons than anyone else in history, even more than Chuck Jones or Friz Freleng. He was the producer and not the director, which is probably why he's not remembered as much. ****