Ronald Renault is so techno-phobic he has only paper contracts. Once Michelle, Claire and Mike reached the roof they could have ripped up the contract and not have any reason to confront Ron.
After Michelle is released from jail she has nowhere to live and seems to have no money at all even though prior to being released she is told all her accounts had been frozen, not cleared out. It's unlikely that she would have lost all of her money for a crime whose jail sentence is only 5 months, particularly if she was significantly wealthy beforehand.
Several times throughout the movie it is referred that Michelle is a "parolee". She was investigated by the SEC and would have been convicted in federal court then imprisoned with the Federal Bureau of Prisons. She would not have been on "parole" upon release. The Federal government abolished parole in 1987 with the Sentencing Reform Act.
There is a limited amount of time that one's assets can be frozen by the government. Since Michelle is an ex-felon and not a parolee (there is no parole in the federal prison system) the adjudication of her sentence is down and her assets would have been released. Even if the government seized some as fines and retribution for any possible victims, Michelle should have more than enough assets to remain wealthy, including deferred compensation.
Claire's apartment building has a street number "9855" painted over the door but the actual address numbers (3101-3105) were left on the glass door.
The burglars plot their heist in overwrought fashion with all the usual film clichés, but forget one basic precaution: wearing gloves to eliminate fingerprints.
The banner at the Dandelions meeting misspells "troop" as "troup."