When sending the command sequence to lock out the abort signal, Houston ends the sequence with 0-1-0-1-Enter, but when Alan Shepard repeats it back while inputting the commands, he says 1-0-1-0-Enter.
During the video honoring Shepard, they say he was preceded by Ham the chimp and Enos the chip. However, this is inaccurate, though, Shepard did indeed have 2 primates in space before him: 1) Ham on Jan 31st 1961 (same type of trip as Shepard); 2) Yuri Gagarin on April 12th 1961 (he made it into Low Earth Orbit (LEO) & orbited the earth one time). Shepard's trip was on May 5th, 1961. Then came Enos the chimp, who flew into LEO and orbited the earth in Nov 1961.
As Shephard is starting the descent burn, the shot shows the room at MIT. The footage is being ran backwards, as it shows a person walking backwards on the upper left and backwards movement on the upper right of the screen.
Alan Shepard repeats back the numbers to Houston. He says, "1010 enter", when the numbers given were "0101 enter".
As Alan Shepard approaches the oil rig, there is a white mid 1980's Ford F-800 work truck clearly in view.