HOLIDAY #59 STINKER

Hi all, hope you had a good new years. Got quite a few I need help and/or confirmation with in this one. THanks in advance for your help.

20a: bullocks O?EN (oxen?)
126a: mushroomed B?R???N?D
157a: outright F?A?LY (flatly?)
179a: creative film director AU?E??
314a: incidental comment ASI?E (aside?)
321a: early police, __ __ runners B?W ?T?E?T (... street)

135d: dismissed from army CAS?I?ED
204d: processed blood plasma ?E?UM (serum?)

Thankyou soo much!