On the subject of bombs...
The bombers never build anti-interference measures into their bombs, such as trembler switches, secondary detonators, x-ray sensitive triggers, a pressure pad wired to to the detonator or any one of a dozen sly and nasty ways to kill the person attempting to disarm it. There's a reason real life bomb disposal experts clear the area and force a detonation, you know.
Also, terrorist bombers never score an 'own goal'. Think of all those times you've improvised with your cooking. Now think of all the times that improvisation went horribly wrong. Now, imagine improvising with explosives...
When bombs do go off, most humans can run faster than superheated air travelling at hundreds of miles per hour and never have all of the air sucked out of their lungs by the vacuum created by the air becoming superheated in the first place.
Leaving bombs alone for a moment, but sticking with action oriented films and shows:
The "secret" part of secret agent is optional. Just ask Bond, James Bond.
With the exception of Jason Bourne, no-one seems to know how to fight properly.
Cars are made out of dynamite, judging by how often they explode violently.
Being shot in a limb doesn't really hurt at all. Tie a bit of cloth around the wound and you'll be fine.