Changed plenum gaskets, is it now leaking oil?

[Braker]

Hey everyone, 

I'm working on a family member's 2007 Lexus ES350. The dealer said some spark plugs or ignition coils were misfiring, so I decided to replace all the spark plugs with new ignition coils that I found linked at this YouTube video.

It was hard to get to the last spark plug in the back, so I watched another video on how to remove the plenum by The Car Care Nut. I did managed to replace all the spark plugs and ignition coils, torqued it down to 13 ft lbs.

While there, I decided to replace the 3 plenum black gaskets with orange ones as well as the throttle body gasket. Got the parts from Toyota instead of Lexus (I hear they're the same parts). The problem now is I think there's oil leaking on the right side of the intake manifold. I didn't notice those two black spots before and when I rubbed it with my finger, the oil seemed wet. There's also a growing black spot near where the throttle body is. I've attached some pictures with those areas highlighted. 

My questions are:

Are these black spots normal? Did I get the right gaskets? I will take everything apart to double check but I wanted to consult with you all to understand this situation better.

I used the BlueDriver dongle to clear the codes P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0351, and P0352 (plus some others including P16A1, C1201, B1421) for the misfiring and when I scanned it again, those spark plugs and ignition coils codes didn't reappear. However, I now have codes P0368, C1201, B1421, and B1424. I believe P0368 is because I forgot to hook up a camshaft sensor near the back between the intake manifold and the firewall. The 2 codes B1421 and B1424 are air conditioner codes, not sure what those are.

I'm concerned if I've put everything back the right way. Please see the pictures with the green arrows and lines, and let me know if you notice anything wrong.