Actually looked up the highlights:
So With Castle on the floor, Booker:
- Hit a low post turnaround over Harper after Castle went help out a Goodwin drive. (around 45s). I think this counts as a shot against Harper.
- Hit an elbow pull up over Castle after Castle was screened by Nigel Hayes-Davis. Should definitely count against Castle (around 50s mark)
- Passed to grayson Allen for a wide open 3 while Champaigne was guarding him. Castle was supposed to be guarding Allen but went help out to double Booker. (1:25 mark)
- Passed to Goodwin after shouldering Castle to the floor for a wide opened 3. Barnes had to help out on a Dunn cut, and Vassell had to leave Goodwin to block off the cut. In retrospect Vassell should have stayed no his man and Wemby should be helping out. (1:38)
- Pull up from 18 after a Mark Williams screen, right in Castles face. Should definitely count (1:48)
- Passed to Williams for a bunny after Castle switched off on him and Vassell had him instead. Castle was pretty lost there (2:05)
- Drove in for a layup vs. Barnes. Castle was guarding Grayson Allen (2:15)
- Fast break layup when Castle was trying to crash in for a defensive board. I think this should count but I doubt it (2:21)
- Turn around from 10 feet right in Castle's face. Definitely should count (2:38)
- Hit a pull up around the elbow after Barnes was switched onto him from a Dunn screen. Booker was originally guarded by KJ. Castle was on Williams (2:45)
- Passed out to Gillespie allen for a 3 while Castle was guarding him (2:56)
- Passed to O'Neale for a three in a semi fast break while Castle was guarding him (3:10). At this point the Spurs were helping on doubling anything Booker it seemed.
- Pulled up from the elbow off a screen after Castle was guarding him. Vassell came to help and challenged. Should have counted but again i doubt it. (3:17)
So there were at least 3 shots Booker nailed on Castle, potentially 5. Booker scored or assisted on 23 points, so Castle didn't really do that well and the matchup thing doesn't seem to be overly accurate. It also showed Booker had 4 assists when I counted 5.