In the first 15 minutes, during an argument between the lead biker and one of the gang, a stick of dynamite is lit and thrown away into a bucket of water, which extinguishes the fuse.
Water will NOT extinguish a lit fuse. Ask anyone who's gone fishing using dynamite.
As Brisco and Bowler ride in the cycle and sidecar trying to locate the motorcycle gang thieves, a close-up with tall grains behind them doesn't move - they're standing still while supposedly in hot pursuit.