Continuity mistake: Just before Burt gets ready for his record-setting attempt, he wraps some asbestos cloth around his leg to protect it from the hot exhaust pipe. This does not allow him to fit his leg within the cowling of the bike, so he throws it off and puts his leg in without the protective covering.As he inserts his leg into the cowling, you can see that his pants leg is bunched up around his calf, not tucked into the top of his sock, as is Burt's usual procedure.However, a close up of the leg only a few moments later shows the pants leg tucked into the sock, and he could never have done that once he was fully seated in the cowling.
Factual error: At the beginning of the pie cart scene, street signs are visible in the background. They are a style that was introduced around 30 years after the time the film is set.
Burt Munro: So what are you doing in Vietnam?
Rusty: Umm, I'm involved in Operation Ranch Hand.
Burt Munro: What's that? Farming or something?
Rusty: Ah no, not exactly. We ah... we just started this program... we are spraying the jungle from the air with herbicides, so the enemy the Vietcong don't have any place to hide. Right... Agent Orange, we call this stuff.