My take is that Lees hits Ellis square across the face with his shoulder, agree with the mitigation to yellow and I can see why Ellis needed treatment.
The Lees headclash with Havard was just that, Havard was perhaps lucky as he led with the shoulder but contact was head to head so painful I guess.
Dupree took an accidental shoulder from Paasi, probably the most debatable one but he had just ran about 40 metres after the charge down

I've not seen the other games yet.