Решение:
- I'll play football today, but I haven't decided. (Correction: 'haven't' is more natural here as it refers to a decision not yet made).
- I'm going to buy some new shoes. (Correction: 'me' is redundant here and makes the sentence unnatural).
- I don't know anyone like you. (Correction: 'no one' is a double negative; 'anyone' is used in negative sentences).
- My dad says he'll buy a new car. (No mistake found).
- What are you doing tonight? (Correction: Present continuous is used for arrangements in the near future).
Ответ: 1. haven't; 2. some new shoes; 3. anyone; 4. (нет ошибки); 5. are you doing