The original release of Llamatron came with seperate version for 1mb owners that has better sound fx. Samplerate on 512k machines was cut half which, according to developer, made the speech samples sound quite bad.
If you registered Llamatron, you received llama poster, newsletter and a copy of 'Andes Attack'
I *did* get one "disgusted of Tunbridge Wells" letter, albeit a mild one. The release version contained the whole "Oh, fuck!" sample, but the game was set so that a certain time after that sample was triggered, another explosion sample would be triggered, cutting off the swearing appropriately. But Mr. Mildly Disgusted had discovered an oversight - if you hit Pause in between the time the swearing was triggered and before the obscuring explosion was triggered, the whole "Oh Fuck!" sample would get played. (Source: Jeff Minter)