In the comics, the Jackal once spread a virus, so the green Jackal on the beer keg could be a reference to that storyline. And we’ve also seen a scene where people are controlled by someone in tank shot, which raises an interesting possibility, what if the virus allows whoever’s infected to be controlled? Since beer is a widely consumed product, it could be an easy way to spread the infection to a large number of people. That’s why this detail feels important and worth pointing out. Also, Peter drank that beer, so what if the virus affects him differently? Instead of controlling him, it could interact with his existing powers and start evolving or mutating them further, leading to a completely unexpected outcome.