#1 - 5 Mistakes
There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes
1. The word "are" is repeated twice.
2. The word "to" is repeated twice.
3. The word mitstakes is misspelled. Its should be mistakes
4. The sentence is missing a punctuation mark and should end with a period/full stop not with semicolon.
5. Since there are only 4 mistakes, therefore, the statement of having five mistakes in the sentence is wrong which is the 5th mistake.
Or
Another theory is that the sentence should end with a period.