Take up reel on mission briefing recorder changes from a larger hub 3 spoke reel to a smaller hub 4 spoke reel during the destruct sequence.
When the mission is over and the IMF teams leaves the NY back lot, the studio streets are clean. However, when Kroll runs onto those same streets only a few minutes later, the streets are littered with blowing newspapers.
In the 1937 apartment the console radio presets show Los Angeles radio station call letters beginning with "K" - KNX, KMPC, KFWB, like most stations west of the Mississippi River (there are many exceptions). The setting is supposed to be New York City so the the station presets should probably be mostly 'W' radio station call letters.
The current day baseball play-by-play is from the June 1, 1971, Yankee game against Oakland. This was a night game that began at 8:05 PM. Kroll's haircut was at 10:45AM.
You can tell the cop who is standing guard in the hospital in the teaser was replaced with a dummy as it starts falling back towards the wall just as the explosion goes off.
The detective at Gladys' hospital room identifies himself as David St. James. However, the end credits give the character's name as St. John.
Considering his age and leg impairment, it seems odd that Kroll would travel to the barbershop without a henchman/bodyguard. Whereas Stevens, who admits to being younger, is always in the presence of henchmen.