Other mistake: When the NASCAR pit crew starts working on Herbie at the barn, they initially pull a bunch of parts and tools from their racetrack trailer. One man is carrying a distinctive VW-only wheel rim, which would definitely not fit their regular NASCAR car. The decision to race Herbie had just been made, so they would not have been carrying VW spare parts yet. Nor could they have pulled one of Herbie's wheels yet since they were still carrying the jack to the barn.
Herbie: Fully Loaded (2005)
1 other mistake
Directed by: Angela Robinson
Starring: Michael Keaton, Matt Dillon, Lindsay Lohan, Breckin Meyer, Cheryl Hines
Continuity mistake: When Maggie goes to look at the green Nissan 200SX, it has a set of standard Nissan alloy wheels. When the shot cuts to Herbie being lifted above the Nissan, the wheels have now changed to standard steel wheels.
Jeff Gordon: This car just winked at me.
Jimmie Johnson: A racecar just winked at you?
Jeff Gordon: I swear. The car just winked at me.
Jimmie Johnson: Are you feeling OK? Is it the pressure?
Trivia: When Crazy Dave is putting the chain on Herbie at his yard, Herbie squirts oil all over his foot. This is a reference to the 1968 film "The Love Bug", in which Herbie did exactly the same thing to Thorndyke (David Tomlinson).
Question: Why was the name Max used for the helmet? Does it connect to one of the other 6 movies?
Answer: Yes the third movie Herbie Goes to Monte Carlo there is a character in the movie named Max.
Yes, but that Max didn't have two X's in his name, plus he was a thief trying to steal Herbie, not race him with a big racing suit.