In the excerpt you provided from Sinclair Lewis's "Main Street," the author employs irony to illustrate the difference between Carol's perceptions of her surroundings and the reality of small-town life. In your question, however, it appears to be referring to a specific paragraph labeled '8' that is not included in the text you've shared, which makes it difficult to address the exact point regarding irony directly related to that paragraph.
However, based on the general themes in "Main Street," Lewis often contrasts characters' expectations with the reality they encounter—highlighting issues such as disillusionment, social dynamics, and the challenges of adapting to small-town life. If the paragraph in question discusses a hotel's condition versus its perceived grandeur, the irony would serve to underscore the gap between illusion and reality, which is a recurring motif in Lewis's work.
If you could provide more details about the specific paragraph or context you're referring to, I would be happy to help analyze it further!