Corrected entry: When the team plans their mission to break into the mansion, they estimate that there will be one minute, 20 seconds between the time the power is cut and the time the backup generator goes on. When Owen kills the power, an announcement is made that the backup generator will take over in 40 seconds, causing the team some concern. The actual time between when the power was cut and when the backup generator kicks in is one minute, 20 seconds - just as predicted. Oddly, Owen doesn't seem to be moving any faster or trying harder to find a place to hide even though he's under the assumption of only 40 seconds of darkness to work with. A last-minute change to the script, perhaps?
Corrected entry: In the first episode, "Everything Changes," Gwen is told that "Captain Jack Harkness failed to report for duty" on 21 January, 1941. However, in "Captain Jack Harkness," Jack tells Tosh that the real Captain Jack Harkness will be killed in combat, taking down 3 Messerschmidts and getting the rest of his squadron safely back to base in the process the next day. Surely, at least one of his men would have reported that the Captain died a hero. If not, how can he fail to report for duty if he was in the air?