There was a telling moment at the Republican National Convention yesterday that has been overshadowed by the high drama of Donald Trump appearing at the convention and the subsequent controversy over the speech given by his wife, Melania.

During the afternoon session there was a last gasp effort by anti-Trump delegates to challenge the final report by the rules committee. Angry delegates shouted down the chair of the committee for refusing to allow a roll-call vote on accepting the rules committee report. It was an old-fashioned chaotic floor fight with lots of shouting and chanting.

The incident received scant attention in the press, but it demonstrated that there remains a sharp division among some delegates over support of Trump as their nominee. Political commentators quickly compared the revolt to the Republican National Convention of 1976, when Gerald Ford was nominated but only after narrowly defeating a strong challenge from former California Gov. Ronald Reagan.

I covered the 1976 convention for NBC News, and there are big differences between what I saw then and what I saw yesterday.

The biggest difference, of course, is that there is no challenger to Trump. There is no Ronald Reagan standing by in the wings waiting to be called onstage. Another difference is that the revolt in 1976 was mostly carried out behind closed doors. There was nothing like the angry outbursts and chaos that happened here yesterday.

The unexpected floor fight by anti-Trump delegates here in Cleveland might be the first and last time we see angry challenges by delegates opposed to a Trump presidency. But like everything else in this political year, predictions are problematic. Another open question is how Trump will enter the stage for his acceptance speech on Thursday night. Will he walk onstage from the wings, or will he first appear as a backlit silhouette as he did last night?

Joe Angotti is a Monmouth College visiting distinguished professor of communication and former senior vice president of NBC.