I recently upgraded one server to 8.5.3 as well as a recent extension library update (8.5.3.201110131854NTF) and have noticed a few quirks:
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The slider in the tag cloud does not function (the number of listed tags remains unchanged with slider movement)
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Sections (ie. to display the abstract, article info, attachments) do not expand/collapse
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Article edit buttons are nonfunctional
These same actions function appropriately on a server running 8.5.2FP1. Additional notes: originally modified with 8.5.2 designer, the latest modifications to my version of this template have been completed with Designer 8.5.3(however the template resides on the 8.5.2FP1 server).
I'll try to follow up if I find out more about these.