When Isabel takes Brandon back to her apartment after unexpectedly popping into his office, one can hear her putting ice into glasses as she fixes drinks, but no ice subsequently is seen in either of their glasses.
When Mark calls Brandon at Isabel's apartment, he asks for the address, but it's already on the pad with the phone number. This isn't a Goof, however, as Jessie wrote down the address when she was talking with Isabel earlier. Mark had no way of knowing that Brandon was at that address.
When Josephine enters Jessie's room while Jessie is crying after reading the paper about the previous night's events, the interior door has a deadbolt lock on it but no corresponding plate or bolt is on the door's edge. This is a common shortcut of set carpenters; the same is seen with Isabel's apartment door.