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VCR's are the only things that can have major synch issues that I know of.
DVDs(and some other devices) can have macrovision which shows up as horizontal lines in an otherwise perfect(and synched) picture. Closed Captioning may or may not bother a set(I can't recall it being an issue with any of my sets), but is basically universal in all NTSC signals these days.
If macrovision closed captioning, etc. prove to be an issue there are boxes available to remove such from a video signal.
The isolation transformer is for the power connection for the set. Most sets without an internal power transformer have one side of the cord connected directly to the chassis which presents a shock hazard.
Welcome to VK, and enjoy your stay!
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