Let me try my amateur's guess, as an exercise:
1. Main shaft sealing cord (if the oil is brown, if red it is the gear box or hydraulic clutch leaking). Sealing cord on the back of the engine shaft is difficult to make it tight.
2. Oil filter connections (I think it is another leak). Maybe just not tightened properly.
3. Oil pan - usually wrong tightening (too strong) or the pan mating surface not straightemed. A bit wrong fiting anyway...
But please do not take it seriously, just my guesses, wait for someone knowledgeable to chime in.