Other mistake: When Travis is negotiating with Sport for Iris' services, an off-screen crew member can be heard saying, "but no rough stuff" just before Sport says it. (01:17:00)

Taxi Driver (1976)
Plot summary
Directed by: Martin Scorsese
Starring: Robert De Niro, Harvey Keitel, Jodie Foster, Peter Boyle, Albert Brooks, Cybill Shepherd
Vietnam vet Travis Bickle is a loner in the mean streets of New York City, slipping slowly into isolation and violent misanthropy. In solving his insomnia by driving a yellow cab on the night shift, he grows increasingly disgusted by the low-lifes that hang out at night: "Someday a real rain will come and wash all the scum off the streets." His touching attempts to woo Betsy, a Senator's campaign worker, turn sour when he takes her to a porn movie on their first date. He even fails in his attempt to persuade child prostitute Iris to desert her pimp and return to her parents and school. Driven to the edge by powerlessness, he buys four handguns and sets out to solve all the problems that are troubling him.
Travis Bickle: [Into the mirror.] You talkin' to me? You talkin' to me? You talkin' to me? Then who the hell else are you talkin' to? You talkin' to me? Well, I'm the only one here. Who the f**k do you think you're talking to? Oh, yeah? Okay! [whips out gun.] Huh?
Trivia: The assassination scene in this movie is said to have inspired John Hinckley Jr. to attempt to kill President Reagan. He did it to get Jodie Foster's attention.
Question: When Travis goes into his fitness phase, it shows him hovering his fist over the stove fire. Why is he doing this? What does that achieve?
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Answer: It helps him create a tolerance for pain. As we see, he certainly gets a lot of that dished out to him.