It's the type of inside access into the minds (and ears) of referees that only comes in the weekly feature "Inside Video Review."

Former MLS referee Greg Barkey gives viewers a peek behind the process for four key calls from the final day of the MLS regular season, including two offside calls and a red card that was originally missed on the field.  

The final play is even more compelling: the review of a possible penalty for a hand ball in the Portland Timbers' win over the San Jose Earthquakes. You can listen to the conversation that was had between the VAR and head referee and it's a window into the subjective nature of hand ball calls.