After Pilot Abilene (Justin Timberlake) sings "All These Things That I Have Done", Roland Tavener (Seann William Scott) is found lying on the ground. He gets up and starts to run, leaving his radio on the pavement. Later, we see Roland Tavener walking down the sidewalk with the radio back on his belt.
In the introductory titles, as Pilot Abilene narrates, there is a white map of the United States that implodes towards the screen as he says "Interstate travel visas were required for each state." Right before the map implodes, you can see that the state of Wisconsin is unaligned.
When the home video at the start of the film catches a glimpse of the initial bomb blast, we see the flash and hear the boom at the same instant. Anything close enough to a nuclear blast to hear the boom at the same instant as seeing the flash would be instantly disintegrated.