Heartland

Hi there, don't know if this has been discussed before. I had a listen to the 'Floorshow'-EP yesterday using headphones. During 'Floorshow' (the song) I noticed some real drums additionally being played over the drum machine part, specifically during:
0:10-0:33 min
0:44-1:08 min
1:25-1:40 min
1:48-2:30 min (this part the most obvious)
2:54 min till end.
Did you noticed this before? I was quite surprised I must say.

was a drummer

This was recorded in 1981, wasn't it, at a point when their only release so far had used live drums. They were still refining their sound, I guess.