Corrected entry: In the brothel shoot-out at the end, Travis gets shot in the neck and has a pretty nasty wound - but when we see him a few days/weeks later there's no sign (scab or scar etc.) of the bullet wound on the left hand side of his neck.
Corrected entry: After Travis shoots Sport, he walks over and sits on the left side of the stairway. Then in the next shot, you see him walking up the stairs from the right side.
Corrected entry: The back window of the taxi gets broken out, then reappears unbroken when driving back to the taxi cab station.
Corrected entry: At one point when Travis is in his room doing what he does he rips the arm off his white shirt. A minute later, the sleeve is back on.
Corrected entry: When Robert DeNiro attempts to kill the senator, it is June according to his diary entry, and he has a mohawk. He still has the mohawk later on at the hotel shoot out. In the last scene of the movie his hair is fully grown in. In the conversation with Cybil Shepard we learned the senator received the nomination for president. That had to take place at the party's convention no later than August in the same year.