Corrected entry: When Taejo's sister Horuku comes to give the Grand Prix ticket to the Racer family, Speed racer laments they "don't have a car". BUT- when Horuko walks into the house, you can see the ever present Mach 6 in the background in what should be the dining room. They do have a car and modifying/upgrading it would be far easier and quicker than building a new one from scratch.
Corrected entry: When the GRX crashes in the Grand Prix, a few shots later, the remains of the car are gone.
Corrected entry: In the scene where Racer X is attacking Cruncher Block's truck, at one point, you can see the level of the water in the piranha tank start to go down when the tank hasn't been shot yet.
Corrected entry: Speed drives the Mach 6 in the first two races. This is not possible because they don't build it until before the Grand Prix. And for clarification, the film does not begin at the Grand Prix. There are signs everywhere that say it is the Thunderhead Race.
Correction: There were 2 Mach 6 cars, the one driven in the first 2 races was crashed and destroyed in the 2nd race (after Speed was offered and turned down the corporate sponsorship).
Correction: That's the Mach 5. You can even see the red encircled yellow "5" on the passenger door right before Pops, not Speed, says "We don't have a car." The Mach 5 is a rally car, essentially street legal. The Mach 6 is a T-180. It would take much much longer to modify the Mach 5 because before you could turn it into a T-180 you'd first have to take it completely apart.
Phixius ★