Continuity mistake: When Johnny is walking out of the dirt bike stadium, he has his arms around two women's shoulders. The shot changes, now the two women are holding on to his arms. The shot changes again, and now his arms are free. It happens too fast for him to just let go of the women.
Trivia: A Fantastic Four movie was filmed in 1994 with the intention to not release the movie to the public. The film's distributor, New Horizons, had the Fantastic Four license for some time and would have lost it if they didn't make a movie promptly. When rumors circulated that Chris Columbus wanted to make a movie version of the comic, New Horizons scrambled to film their own version so they could hold onto the license for a few more years. The actors and most of the crew were unaware that the movie was never to be released, but many began to suspect it when the director made no effort to ensure any level of quality in the film. The 1994 version continues to circulate via illegal bootlegs, similar to the Star Wars Holiday Special.
Susan Storm: You were at 4,000° Kelvin! You were approaching supernova!
Johnny Storm: Sweet!
Susan Storm: No, not "sweet"! That's the heat of the sun!
Reed Richards: You could kill yourself, other people, and burn up the atmosphere, ending all human life as we know it.
Johnny Storm: Got it. Supernova bad.