Plot hole: Alberto didn't sign up for the Portorosso Cup, and he enters anyway. This should've gotten Luca disqualified.
Plot hole: Even though Serena gave Amber reasons/excuses as to why she could not provide her with pre-rental approval information (current address, why she was moving, recommendation from a previous landlord, reference from a friend), Amber allowed Serena to lease the loft after she showed her a wad of money to pay for nine months' rent in advance. Even a first-time landlord would not lease a room without conducting an adequate background check and would be leery enough to seek a better-qualified tenant. (00:06:17 - 00:06:50)
Plot hole: When the host family picks up Finley, they tell her that they have just inherited a bed-and-breakfast. Later, Nora tells Finley that while she was cleaning up "in here" she found Finley's brother's notebook "under the dresser." Later it's revealed that Finley's brother had visited stayed with the host family several years earlier. His notebook would not have been in the "recently inherited" bed-and-breakfast.
Plot hole: Charles was a con man, going up the east coast (Florida and North Carolina) offering to do cheap storm repairs, taking the 50% cash down-payment and moving on (fleeing to the next location). As such, he would try to stay away from police/law enforcement officers and not call attention to himself. Filing (bogus) criminal complaints against Peter put Charles in direct contact with the police - a very risky and stupid move on his part.
Plot hole: After the Sheriff crashed into a tree, the Virtuoso passed him up but returned. The Virtuoso asked the Sheriff if he knew "White Rivers" and the Sheriff responded, "Yeah, I know it." The Virtuoso then shot at the Sheriff who was a few feet away and hit him in the neck. The Sheriff was able to run away. Instead of the Virtuoso quickly shooting again, he watched the Sheriff run into the woods and chased him. Despite being "experts", each made numerous shots that missed the other. (01:21:37 - 01:23:29)
Plot hole: Mike was given a conditional release from prison (on parole) and could be returned to prison if he violated the conditions of parole. Associating with known criminals, taking/ selling illegal drugs, domestic violence or other problems would constitute a violation. Mike assaulted and threatened Dahlia - more than enough "bad behavior" to get his parole revoked. Neither Dahlia nor Parker thought to report Mike to his parole officer. Instead, they fled and hid from him, staying in fear. (00:13:15 - 00:45:50)
Plot hole: Lea has a criminal record, which includes theft. Lea told Casi, "You know how hard it is to live with a rap sheet hanging over you? How hard I had to hustle to even get a shit job at the tow pound?" Later, Casi made a reference to "most thieves" and Lea responded she's "not like most thieves." The tow pound is operated by the NYPD, so it is extremely unlikely that Lea would have been hired given her theft record, especially for a position that handles money/cash. (00:19:45 - 00:35:25)