The amount of gold Jacinto puts in his pockets and ties to his belt would probably pull his pants off and definitely make it impossible for him to stand and walk the way he does.
Bomb of that size (approx 500 kg or so, based on WWII bomb size diagrams) would have embedded itself several meters underground, not left sticking out like that.
The first time Jacinto tries to open the chest, he can be seen smoking a filtered cigarette. This is a clear anachronism since cigarette filters only became widespread in the 60s, and this film takes place much earlier.