Star Trek Discovery: Every Easter Egg & Hidden Reference From 'People Of Earth'
5. That New Drink Synthehol
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Forced to blend in with the Discovery crew and don one of their uniforms, Book takes the edge off by having a bunch of drinks in the officer's mess. Michael informs him, though, that he's been drinking synthehol and Book is rightly disappointed.
Synthehol first appeared in Star Trek: The Next Generation and was described as a simulacrum of booze with "intoxicating effects [that] can be easily dismissed".
Unfortunately, Discovery serving synthehol is something of a discontinuity as the TNG episode "Relics" established it as a new invention of the 24th century and something someone from the 23rd century, like Scotty, wouldn't be aware of.