It's interesting how the same situation has completely opposite implications in different countries.
In my country, if the contract doesn't mention overtime, that's great, because it means the company must pay you nicely for overtime, and there is a limited amount of overtime per year. However, if it is explicitly a part of the contract, there may be more overtime per year (within some limits), and less compensation per extra hour (again, within some limits). So if you find overtime mentioned in your contract, that is a bad thing.
In my country, if the contract doesn't mention overtime, that's great, because it means the company must pay you nicely for overtime, and there is a limited amount of overtime per year. However, if it is explicitly a part of the contract, there may be more overtime per year (within some limits), and less compensation per extra hour (again, within some limits). So if you find overtime mentioned in your contract, that is a bad thing.