Update, as I watch further. I noticed that Cassie's storefront has at least 3 different iterations, but that don't evolve through time -- when they need a stock shot of the store's outside look, they just seem to grab one of the three. There may even be four, but I am having eye trouble, so I'm not certain. there is a "flatter" storefront sign, which is flush with the building, basically. Then, there is a sign that is wooden and made to sick out a foot or so from the building. I've noticed that sometimes the sign is unstained pine-looking wood, and other times the sign was stained.
We may have discussed this at the time the episodes aired, but I noticed that, in Season 2 (I think?) in the episode where Martha's son wants to get married and Martha tries hard not to take over, but the bride's mother turns up and is even pushier than Martha with a good dose of snootiness thrown in, that their wedding and/or reception is going to be at the Mill. It is distinctive because of the waterfall nearby. There is a chi-chi restaurant and meeting space there. Very upscale. Then, in season 4, Abigail's techie boyfriend wants to buy the mill, which Martha describes as dilapidated or run-down. When Abigail tours the property with other prospective buyers, Martha points out that a lot of the mill's equipment is left there and it just looks like a big industrial space. (Also, does the town own it? Why is Martha acting as real estate agent? I realize she'd want to attract buyers to stimulate the town's economy, but yeesh.)
And, I laughed in the wedding episode where George asks Nick what he is going to call him, and points out that Nick is George's daughter's husband's wife's stepson. It was not a nod to all the unexplained disappearing characters, but it made me laugh. Cassie's family has foster relations, step relations, blood relatives, and people that were just chosen to be part of the family. (I like families like that!)