Corona, and some other beers, tend to go well with a slice of lemon inside. Is there something particular about the style of beer, or is this a marketing thing?
I would say it's the light body, low maltiness and low bitterness that make it amenable to citrus additions (and perhaps other additions.)
The low flavor and bitterness means:
- if you choose to add something, you need only a little of it before you can taste/smell the addition
- there's less "interference" from the flavors of the beer so the addition tastes cleaner
Contrast with adding citrus to a Czech Pils for example. You'd have to add much more juice - the bitterness and malt backbone of the beer would compete with the citrus additions.
Don't think it's a marketing trick. Imagine all the costs to get the lemon slices out of the bottles.
Lemon in general goes very good with beer. In Germany (not only there) a mixture of beer and lemonade is very common and famous (called Radler or Alsterwasser).