I updated the official Wiki with this the other day but I still can't figure out if it's just something the devs missed or if it's part of some hidden quest or secret. With Bethesda games you never know!
In Vault 111, when you look at the list of the pod occupants, it shows pod C3 occupied by a "Mr. Callahan". If you look into the pod, you will see that the person inside definitely appears to be male. However, on the Overseer's terminal it talks about how at one point pod C3 began to malfunction: the occupant had heart palpitations and it starting thawing "her" out. If Mr. Callahan is the person in Pod C3, then why does that terminal make reference to a female occupant? It also never states what the final outcome of this malfunction was: there is one empty pod and it would be natural to assume that is the pod that broke down and the person died as a result. However, that is Pod C1, not Pod C3. I would love for someone to confirm if this is just a mistake or a hidden clue on part of the designers.