A painted dummy head fakes out the night guard inside Franks darkened cell, while Frank is up inside the vent system, confirming his escape route. The guard passes by Frank's cell twice, as after shots show Frank still toying around the escape shaft. Only a few moments later, the guard returns, suspicious, and remarks to Charlie Butts that Frank must be a very deep sleeper as the footsteps and noises have not awakened him. Then the guard clangs his nightstick on the bars to awaken Frank, but gets no response. He then grabs at the dummy's forehead and suddenly its a "sleeping" Frank - after only a split moment before where Frank was still shown in the vent system. Impossible time-frame sequence. [The cut between Frank outside of his cell and the guard checking on the prisoners may not be a complete moment-to-moment shot. Several seconds or even minutes may have passed between those two shots, quite enough time for Frank to have made a quick run back to his cell.]

After Wolf attacks Frank Morris and both are sent to D-Block, you will see the guards shove Wolf in one of the D-Block sells and then immediately slam the metal door shut. A few seconds later, the guards put Frank Morris in the adjacent D-Block cell, but before they shut the big metal door, they also slide a set of jail bars closed first. They didn't do this for Wolf. [This is because of the way the cell bars were designed at Alcatraz. When the doors were opened they could be closed and locked one by one, and when the last prisoner was locked away the whole landing - up to twenty eight cells - could be locked by sliding a security bar shut. This is what you saw when the guard slid "the set of jail bars" shut. The film was shot on location in Alcatraz and is almost completely accurate.]

The beginning of the movie states that it takes place in January of 1960. The Warden has a picture in his office of John F. Kennedy, but Kennedy wasn't inaugurated as President until January 1961 - a full year later. [The picture on the warden's wall is Dwight Eisenhower, the President at the time, not John F. Kennedy.]