Rescuing Gordon ends the story, so check you have Ambush, Weird War Tales, all 30 collectibles and all 5 tapes before you go on. The one exception is an office door that stays shut: then go on, and finish that tape in free roam. The thugs left in free roam stand away from anything you can hack, which makes the two combat trophies very hard afterwards. If you miss one, a finished episode may not offer a restart, but beginning the pack on another save slot brings back every thug and hack, though collectibles must then be found again. As a quicker try, lead the unarmed thugs at the centre of the park in free roam to the broken Ferris Wheel bridge, then hack the panel beyond it: its Scare can catch the whole group. On Steam only: the ending can stop on a fatal error that leaves the pack at 90% and free roam out of reach, so you would have to play the pack through again.