Affleck shouldn't have taken that directorial victory lap at the end of the film, showing how much his characters looked like the real people depicted, given how much his movie in fact diverted from the facts. If you haven't done so already, read the fascinating 2007 Wired story which goes through the historical fact, or at least this Slate piece which covers the key departures. In short:
- There was no live, costumed script reading before the trip to Iran.
- There was no scouting trip to the bazaar.
- The CIA didn't pull back permission at nearly the last minute, and no one had to call Hamilton Jordan by using his daughters' school as a ruse. The tickets were purchased in advance, and I would question whether, in 1980, an airport's reservation system would have been computerized like that in the first place.
- Indeed, there were no real problems at the airport at all.
I have no problem with Affleck choosing to spice up an already-spicy reality to conform better to mainstream movie expectations and give it a more exciting third act, but you can't manipulate the story this much and then brag about how close you got it. That's cheating. (But it's a really fun movie.)