Stronghold - S9-E14
Continuity mistake: Season 9, episode 14 "Stronghold": When Bratac has cleared the gate in his alkesh, there is a shot of the gate from nearly side on. There is no wormhole, despite the SGC dialing it less than a minute before.
Stronghold - S9-E14
Revealing mistake: Just after Sam shouts to Mitchell to wait for back up, there is a side shot of a soldier firing a machine gun. There are cases going into the gun without the actual bullet in them, showing they are blanks.
Chosen answer: Report 30185 is a joke report referring to the time when SG-1 go back in time to 1969 in the episode '1969'. The joke is that Colonel O'Neil knocked up a hippie and made sure Mitchel was taken care of throughout his life, like how he got into the 302 program while his buddy, a better pilot, did not.