On the last two bars of each time through the dance, 2nd man and 3rd woman both have a polite turn.  Occasionally in this video the polite turn is omitted.

Although this is a 3 couple dance, the instructions encourage 1st couple to repeat the first 4 bars after their second time to end in 4th place and also suggest that optionally the 3rd & 4th couples can do that at the start which is done here.