This “mistake” was not made by Q , if it was a mistake , it was a mistake that was made by the HRC team themselves.
Source: https://wikileaks.org/podesta-emails/emailid/4735
Attachment #1: https://wikileaks.org/podesta-emails//fileid/4735/1430
Attachment #2: https://wikileaks.org/podesta-emails//fileid/4735/1431
(The mistake is in attachment #2)