Not only is the rusty gun on the tray nothing like a Ruger it doesn't even look like the weapon shown later to the girlfriend in the interrogation room, which appears to be a small Beretta.
In season 4 Booth's brain tumor is diagnosed as a cerebellar pilocytic astrocytoma; however in this episode, when Booth thinks his marksmanship may have been affected by the brain tumor, Bones tells him it's unlikely because his tumor wasn't cerebellar. She says the tumor was in the tempero-parietal region. While it is possible his initial diagnosis was incorrect (this was not addressed on the show) it is highly unlikely that these two regions of the brain would be confused on a CAT scan.
When sweets is doing the interview he has his arm bent and his thumb on his mouth but in the next scene his arm is laying flat on the table.
The rusty handgun is said to be a .22 Ruger MkIII, but the gun shown on the tray looks nothing like a Ruger MkIII.
Nigel says that Marylin Monroe had six toes, but that is just an urban myth. She only had five on either foot.
When Booth is seen shooting at the range, he blinks with every shot he fires. Someone with military experience and sniper training would not flinch at the shot like that. The flinching is automatic and unavoidable if you do not fire weapons regularly. This is the reason all the characters in the Matrix movies wear sunglasses, to hide the flinching.
In the diner scene with Angela talking to Gordon Wyatt, she told him that in order to be able to successfully eat the sandwich he was wrestling with, he'd have to distend his jaw like an articulated python. This should have been a reticulated python.