Sorry if this has been asked before

The drums on "River Song" sound different to the usual BB style ... even seems like a backbeat -
This gives the song a heavier edge than is present on most BB tracks... maybe more like "You Need a Mess of Help..."
I'm wondering: was this Dennis? (on both occasions)
And if so, how could he have handled the increasingly tinny-sounding Beach Boys of the early 80s ? (perhaps a rhetorical question)
...poor Dennis.