When Macgyver leaves the house to find Jimmy and save him from those who want to kill him, he wears a blue jeans. When he meets Jimmy on the baseball field, his pants is black.
While getting out of Vectrocon Systems, MacGyver's running dialogue says that his mother always taught him to leave things as he found them, then he proceeds to list of two or three things he corrected before leaving, saying that no one will ever know he was there, yet he mentions nothing about the lamp plug cord he cut with his pocket knife, that can't be fixed properly without being replaced.
When staying at MacGyver's apartment, Jimmy says he spent two weeks in professional baseball. The computer readout of Jimmy's file says he spent three years in professional baseball. Later, after he has been exposed, he and MacGyver still refer to this two weeks of experience in professional baseball (Jimmy says he was the team bus driver).