Okay, tell me if I'm reading way too much in here. I was rewatching "Scooba Doobie Doo" last night and watched the scene with Nick and Greg in the layout room a couple of times. And in watching it, I noticed several things (I have screenshoted them and will add pics at later point).
1. When Greg enters, he starts by standing there staring at Nick until Nick notices him.
2. During Greg's speech, he moves closer and closer to Nick.
3. The look on Nick's face when Greg mentions the liquid soap.
4. After mentioning of said soap, Nick looks at Greg while licking his lips.
5. Nick pretty much... ah... yeah, with his eyes in the next shot, which Greg notices.
6. Greg, having noticed, steps back and quickly points at the scuba tank, trying to put Nick back on topic before he can pounce him in the layout room
7. Nick continues to look at Greg in that way for a while before snapping out of it, understanding in his eyes as he focuses back on the case - mind you, this time it's Nick that moves into Greg's personal space.
8. For the remainder of the scene, the boys are definitely flirting.
Like I said, I may be reading waaay to much into this. And I was home sick... But it has just risen on my list of fave Nick/Greg moments.