Tom Holland was not allowed to read the script for this movie, since he revealed too many secrets for Spider-Man: Homecoming (2017). In one of the promotional videos for the movie, several of its cast members are in an interrogation room refusing to reveal any spoilers, and Holland's mouth is conspicuously taped shut.  Mark Ruffalo revealed that he was given a fake script due to his habit of accidentally spoiling past Marvel movies. He jokingly claimed in an interview that the fake script was better than the real one.