I feel like there's some sort of a missing ingredient here. Like there's the base elements of a good joke, but it's not quite landing.
I think the issue is that most of these behaviours are too outlandish and weird to be funny by being relatable... but they're not outlandish and weird enough to be funny by hinting at weird implications of what life is like on the character's planet, or how the character has misunderstood human culture and might have done in previous interviews. Crying about a red balloon sounds more awkward and uncomfortable than fun, wacky hijinks. The goldfish one is potentially funny, but doesn't quite hit a strong joke because how many interviews had fish at them? Goldfish specifically? Wouldn't a boss of a company with a fish tank have more exotic fish? Why would the alien think a sealed fishtank in an office was meant to be for them to eat? I'm struggling to imagine the scenario.
If I was going to write this joke, I'd draw on my experience as an autistic person enduring job interviews (absolute hell and feels like being an alien) and then I'd push it further. Like go really weird and think about how an alien might misunderstand the contradictions of human or office behaviour like:
- If there is a dog in the office, you may speak to it as though it is a human and ask questions like, "What's your name, little friend?" and "Who is a good doggy then?", in spite of it being incapable of response. Do not, however, do the same if the office contains any of the following creatures; fly, wasp, bee, mosquito, any species of spider, mouse, rat, any species of fish, dust mites, woodlice, rhinoceroses.
- There isn't really an elephant in the room. It's a metaphor that business people are curiously attached to. Do not look for the elephant. Do not ask to see the elephant.
- You cannot challenge "the boss" in single combat to take control. It seems the notes that suggested this is a viable tactic may be slightly out of date. Recommend updating.
- The spinning chairs are not for spinning on. Spinning is a sign of dominance. Remember: Low-ranking humans only spin on chairs in private so as not to inadvertently challenge their leaders.
Stuff like that. Like really push it. Think of situations that would realistically have come up in job interviews, and how an alien would misunderstand them. Make the audience imagine what sort of wacky stuff must have happened in the previous interviews. When I was an exchange student in Japan, I was bored in a station, and reading the list of "things you're not allowed to take on the train" At the bottom of the list was "dead bodies". It was strangely funny because of the implication; if they needed to put that on the list, people must have presumably tried to take a dead person on a train and said "but there's nothing saying I can't" at least once.