Just saw DS9's Sons and Daughters and just noticed how Alexander's first scene is framed so Martok is blocking Worf's line of sight to the officer on the right during the roll call, indicating that they intended for Worf not to be able to see Alexander until the big reveal, but then after a few seconds of this they cut to a reaction shot of Worf where he clearly DOES notice Alexander.
It's almost as if the scene was played out with Worf not noticing his Son until the end and then that being the big reveal before the credit sequence but that didn't work so they re-shot it to move the tease to being Worf telling Martok he is his son and did some second unit shooting adding a reaction shot of Worf actually noticing Alexander instead of remaining oblivious.
A minor thing really just thought it was funny Martok was always standing in the way of Worf and Alexander in that scene!