How can I thank/acknowledge people during a short presentation?
You can put such acknowledgements on the very last slide, which will stay up while you field questions after your presentation (unless you need to flip back to a specific slide to answer a question).

Don't recite every single name in a presentation. Just end your talk like this:


  Finally, I'd like to thank everyone who has helped me in this project.


Then look expectantly at the session chair, who should lead the applause and ask for questions, while everyone who is interested can read your acknowledgements on the slide.