These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Angst? What Angst?: The usual Trapped in Another World kind with Jason, who's remarkably quick to adjust. Then again, only one person went to see him off on a potentially deadly mission, so his connection to home doesn't seem to be that strong. This trope is also justified as Jason actually is from Atlantis, making 'our' world the one he was trapped in.
Double Standard: Jason fights Ariadne's brother after he drugs her but has no issue with Heracles using the Siren spell on Medusa. In other words, it's fine for one of the group to use a mind altering substance on someone for love (along with the implications) but not for a family member to knock-out a person with the intent to save their life.
Not exactly, he doesn't find out Therus intent until after there fight, at the time he thought Therus was just kidnapping her (and wasn't completely trusting of him to begin with) and its Ariadne who disagrees with leaving and Jason supports her. Also he's clearly by no means fine with Hercules using the spell on Medusa, as he joins Pythagoras in calling him out on it after they find out (likewise nothing in the episode suggest Hercules was in any way in the right for doing this), its just they had more important things to worry about at the time as the spell was by this point killing her. Besides its never indicated that Hercules and Medusa went any further than basic dating and at the end Jason excepts his friend simply made a very foolish mistake out of desperation.
Not to mention Jason and Pythagoras, which already has a good following on the internet. The Jagoras shippers will state the significant looks between Jason and Pythagoras, the luminescent blush Jason sports once while looking at Pythagoras, the fact Jason switched places with Pythagoras to stop him being sent as a tribute to the Minotaur, then Pythagoras was so quick to offer to go on a life-risking mission to rescue Jason from being killed as a tribute to the Minotaur, the rather...cuddly first meeting, the walking extremely close to each other, and Pythagoras constantly checking an oft-topless Jason out. Blatantly. Fans reckon its only a matter of time before it becomes canon.
In the season 2 premiere, Pythagoras outright says "I love you." to Jason and Hercules, without really elaborating on whether he means platonic or romantic love. To add to that, he mentions he really doesn't understand his feelings, meaning it's possible even he doesn't know.
The Woobie: Medusa, after being turned into a Gorgon.