I've found video and stories of protesters temporarily closing entrances. I don't see how that excuses the performance of the press secretary.
I also don't think inauguration attendance really matters. The Trump campaign intentionally tried to decrease turnout during the election. It's only logical that generating voter apathy would spillover into the inauguration. Furthermore, I've never seen a president be judged by the attendance at his inauguration ceremony.
The only real issue is the lies the Trump team are saying about that attendance.