When It Rains, It Pours - S5-E2
Continuity mistake: When Liz flicks her cowboy hat at Pete he exclaims "you got sauce on me." When the scene starts Pete's shirt is clean. As Liz flicks her hat the camera points at Pete and there's already lots of sauce on his shirt, before one extra bit hits him. As Liz walks away and camera cuts back to Pete at the end of the scene and the extra sauce from the flick has gone.
Operation Righteous Cowboy Lightning - S5-E12
Continuity mistake: Jack walks into the writers' room. During a wide shot, you can see that Lutz has a pair of sunglasses resting on the back of his head, near his neck. During his close up, the sunglasses are gone. The next shot is another wide shot and the sunglasses reappear. (00:05:10)
Answer: Maybe s02e14, "Sandwich Day"? Liz is talking to Floyd and asking if the girl who answered his phone has a lower back tattoo with a Chinese character that is suppose to mean "peace", but probably means "I have chlamydia." But nothing about it being a tribal tattoo.
Bishop73