He may have put the gun back?? I don't know, it could just be a simple error!!

Multiple takes, maybe a tweak in the script...

I noticed in Season 2, Episode 5 that Rigsby says to Cho "I told Grace I love her." Cho says, "Wow, Ok, well done, then what happened." Rigsby says, "Well nothing, Jan interrupted . . ." He calls Patrick Jane, Jan instead of Jane.

Maybe I look too much in the details (that's Jane's fault, I'm becoming a mentalist too XD), but I actually noticed various mistakes in different episodes of both seasons. Little things like one scene Jane has his hand in a particuar position, one second after (same scene but different angle) his hand has a complete different position etc... Actually I notice mistakes like these in every show I watch (and I watch A LOT of shows XD), they're small things, but I think that even the smallest details are important... After all no show is perfect :)

lisbon also said "ironically" instead of 'sarcastically' in season 1 but i t hink that these mistakes kind of add to the show in a way. i mean, who talks perfectly all the time? only characters, right?