The GUI of the computer in Flint Lockwood's lab changes from either a Unix / Windows interface, with restore, minimize and close icons on the windows on the right initially. However, when his dad sends the email, the GUI is a representation of a Mac OS with the icons on the left and in standard Mac OS colours.
When the clouds are seen approaching Manhattan, the city can be seen. The Empire State Building is located in Upper Manhattan, but yet is portrayed as being in Lower Manhattan, almost near what was then Ground Zero.
The FLDSMDFR breaks the water molecules to hydrogen and oxygen, and recombines them to create bacon. However, food consists mainly of carbon, which can be derived from water only by nuclear fusion, and it can't be done by the machine microwave energy.