I agree with a lot of you have said - stopping and getting out of the truck was ridiculous. There's something to be said for putting your foot on the gas and mowing them over. Truck vs. men & motorcycles, gee, I can't possibly think of which would "win". The guys with the motorcycles would be too busy getting out of your way to get a good clean shot off.
It's almost like the writers said "well Darryl is going to stop the truck because he'd be worried about one of their gunshots making the gas truck explode". I'm SO sick of the bull**** Hollywood myth that shooting a gas tank causes instant explosion. Every writer that falls for that cliche, needs to be sat down and forced to watch the Myth Busters episode
(shame on the Discovery channel for the spelling error of "Expoding" instead of "Exploding") where they proved that shooting a car's gas tank with a gun caused nothing other than the bullet to go in one side and out the other. So yeah, maybe the gun shots would have punctured the tank, but it would have just meant that they were leaking gas, nothing more.
Jessie's older son getting the jump on Carl? Holy cow, how ridiculous - something that happened solely to move the plot along because having this group bunker-down in Jessie's house is "boring".
And Jessie's younger son? He must have a learning disorder or something. What makes that kid think "this would be a great time for me to call to my mom" and where the hell is Jessie's brain not to just squeeze his hand to give him a signal to shut the hell up? Maybe Jessie did think of doing that and realized that her precious little moron wouldn't have gotten the hint.