Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
The referees ruled that the Jets had too many defensive players on the field by a review in their game on December 23, 2018.
Can you review offside, holding, or any penalty for that matter?
Penalties are not reviewable, except for number of players on the field before the snap. See the NFL rulebook.
Required, but never shown