When President Wayne Palmer is first escorted to the bunker, the split screen shows him walking to the bunker with both hands swinging by his side, and the other split screen shows his right hand in his pocket
7 minutes and 15 seconds in, when the clock shows 10:07:14 and people are seen running in the streets during the aftermath of the nuclear explosion, the actor who plays President Wayne Palmer, D B Woodside, is clearly seen as an extra running in the crowd wearing sunglasses while holding a young girl's hand.
Graeme lives in Indian Falls, which is at least an 8 hour drive from Los Angeles. Jack makes it there by car in about 20 minutes.