Real weird one for me personally and I'd never be that bothered seeing it in person but when people do two 180s in a row that don't match. Worst be front 180 and then halfcab back.
Like front 180 then front halfcab work as a regs then fakie thing, front 180 then switch front 180 as a mirror, front 180 then switch back 180 as a full circle. But every 180 has one it doesn't quite flow well with.