Revealing mistakes: When Spritle and Chim Chim are "outside" tanning themselves, the stage ceiling can be seen in Spritle's reflector.
Revealing mistakes: When Speed and Trixie are parked on the hill in the rain, the freeway visible behind Trixie's head is not animated. There are solid white lines representing oncoming traffic and solid red lines for traffic moving away.
Errors made by characters (possibly deliberate errors by the filmmakers): When first visiting the Racer family, Royalton says one line in German - "Pfannkuchen sind Liebchen" - and translates it to "pancakes are love." "Liebchen" is a very old fashioned German word for lover, the correct German sentence would have been "Pfannkuchen sind Liebe."
Continuity: When Royalton visits for the first time, the third button on Mom's shirt is undone. The next time she is visible, the second button is unbuttoned. From then on, all the buttons are buttoned.
Continuity: The first time you see Speed Racer in a race (the opening 5 minutes) the visor on his helmet disappears and reappears.
Errors made by characters (possibly deliberate errors by the filmmakers): Near the end of the film (2:06:51), "The Racing Chronicle" has a typo. "No.42/54 Independent Daily Racing News piublished by THE RACING CHRONICLE,..." should read "published" instead of "piublished."
Revealing mistakes: During the second leg of the Casa Cristo 500, when Speed spins around to avoid Snake's oil spill, the back side of the Mach 5 goes off the side of the road. The effects and angle of the car are the same as if the car was completely on solid ground.