Josh Schimel (faculty member in EEMB and ES) has an interesting post on his blog about a recent trend in talks.
(I)t has become common to end with an acknowledgements slide, usually that has a long list of funders, advisors, students who helped in the lab, etc. And since speakers are usually running out of time, they often skim over the list, almost dismissively, which does little to honor the contributors. In any case, to borrow a famous quote “Frankly my dear, I don’t give a damn.” What we want to learn from your talk is not your assistants’ names, but your science.
A final acknowledgements slide shuts off the conclusions before we've had a chance to assimilate them or to write them down—it undermines the message. That is shooting yourself in the foot, or maybe some part of your anatomy higher up and more vital.
Read the full post here: Why do people blow the punchline in scientitic talks? The destructive effect of acknowledgements slides.