A tiny circle with your free foot as pivot during a forward ocho. Coordination of the foot circling and the hips flipping as your change direction is key. (I made this name up, so don't try to ask anyone else what the 'rulo loco' is. They will think YOU are loco!)
Ochos with cha cha cha -- it is a '1-2-3, 1' rhythm, as in 'step-2-3, step'. The 2 tiny extra steps are embellishments that the lady can add in as the man leads a back or forward ocho.
This video illustrates tapping on the '2', if you count '1-2-3-4' for each beat. ('1' being the downbeat, '3' being the upbeat or exact middle, and '2' and '4' being the places inbetween or the quarter beats). It is a synchopated embellishment.
This video illustrates tapping more than once during the beat. Possible combination are tapping on '2' + '3', on '3' + '4' or '2' + '4' with the step coming on the '1' always - the downbeat. (Using the system of count '1-2-3-4' for each beat, '1' being the downbeat, '3' being the upbeat or exact middle, and '2' and '4' being the places inbetween or the quarter beats).