Common errors with AM/PM notation: - Avoid writing "12:00 PM" as it implies midnight rather than noon. Instead write "12 noon" or "12 midnight". - In formal writing, capitalize AM and PM in the US, while lowercase is standard in the UK. - The differences between i.e. and e.g. are that i.e. means "that is" and is used to restate or define something previously stated, while e.g. means "for example" and is used to provide examples.