Can deflect bullets with one finger while drunk...
Cannot breath in space,
Like Future Trunks, Kid Trunks, Goten, Bulla and Pan, Gohan lacks the Saiyan spirit and is less determined than Full-Saiyans (Goku, Vegeta, Bardock etc) due to his human side inheritance taking over him
Lost his motivations and will to fight as he got older, prefering to fulfill his childhood dream and become a scholar. And he would only train and fight to protect his love ones or if necessary.
Can be blinded by his own fury, which can lead to serious consequences.
Gohan was prone to overconfidence, even dipping into sadism during his battle with Cell and seeking to prolong his suffering as retaliation for his crimes
But some reason, can't catch a earring while sober