xXx's '10th vehicle' was a 1967 Pontiac hard-top GTO (Gran Turismo Omologato; affectionately nicknamed a Goat). It likely had a 400 ci 'small block' V-8 under the hood.
Dom Torreto's purple muscle car in Fast and the Furious was a 1970 (1968?) Dodge Charger R/T (Road and Track), probably powered by a 426 ci 'big block' Hemi. At one point it was accessorized ...
As per the Movie Mistakes factual errors listing this really couldn't have happened:
During the first race a square plate on the floor falls off Brian's
Eclipse. The Mitsubishi Eclipse is a unibody car; the frame and body
are built as one solid piece, and it does not have floor pans. While
some racers might put a steel plate in the interior as a ...
To the best of my knowledge, it's never stated outright that Harry is in some sort of trouble although it is strongly hinted at with the following dialogue:
Harry: Brian, you're messing with my business. When Dominic drives,
he's golden. Kids pour in. They want everything he has. Every
performance part. They pay cash!
Brian: What did Dominic say?
When Brian is "arrested" and taken back to the posh house that is being used by the FBI (Agent Bilkins) and Police (Sgt Tanner amoung others) to stage their operation, Harry comes up in conversation...
Bilkins: You want time, buy the magazine. We don't have time. Just get me something I can use.
Tanner: Is Harry cooperating?
Brian: Like a guy ...