Star Trek: Strange New Worlds

Bruce Horak, the actor who plays Hemmer, is legally blind, just like his character's species, the Aenar, who are also blind.

There are some rank insignia mistakes. Number One is introduced as "Lieutenant Commander Una Chin-Riley" yet she is wearing the rank insignia of a full commander: two full stripes. A Lieutenant Commander's rank insignia is a full stripe under a thin stripe (in TOS it is a full stripe and a staggered stripe). It is not uncommon for a ship's first officer to be a Lt. Commander if they have not been in the position long.

Spock at this point is a Lieutenant but he is wearing Lieutenant Commander's stripes; a Lieutenant just has one stripe. La'an is the ship's chief of security and the ship's second officer. She is also wearing Lt. Commander stripes but is addressed as a Lieutenant, but it would make more sense for her to be a Lieutenant Commander. Either way both of their rank insignia are not matching the rank they are addressed by.

Ortegas is addressed as a Lieutenant but is wearing Lieutenant Commander's strips. A Lieutenant Commander may be addressed as a Commander or Lieutenant Commander but never as just a Lieutenant, so either her rank insignia or the manner she is addressed by the rest of the crew is in error.