I think that there are quite a few popculture refernces that are in FO's 1,2 & 3 and FO:NV that don't necessarily come from the 1950's retro futurist milleu. Fear and Loathing was from the 70's making any of it's cultural references out of place in New Vegas.

The Fallout world is very 1950's retro future-ist. I'm thinking the reason they didn't put any nods to Fear and Loathing is that it's the wrong time period. No i dont think they should do anything like this, Ya see in Fallout 3 and fallout 1 The humor Was calm ,well timed, and Suitable, whilst in Fallout 2 and Fallout New vegas had Forced humor, they would place these utterly ridiculous things that dont fit in with the seriousness of the games setting and arent actually as funny as they think they are, New vegas should have been a desolate, abandoned place with nothing to laugh about in it, It would have been much more suitable Yeah, to see a huge convertable red cadilac come flying down the I15 pursued by bats with two demented individuals ranting and howling at everything and uld be a nice add to wild wasteland :D Now I just hope they include it in some DLC I was almost expecting a Hunter thompson-esqe character, with a hulking, half crazed lawyer to appear on interstate fifteen and start screaming about bats and nazis, or better yet, have a quest based on his interactions with those psychos, but alas, there was none. It's my opinion that fallout new vegas is certainly a worthy successor to fallout 3, improving and innovating on gameplay and story to make a riveting game, But I am very dissappointed they didn't include any references to Fear and loathing in las vegas in there.

Fear and loathing fallout new vegas