Are some typos permissible if submitting a manuscript for potential publication?
This stuff happens, and everyone knows it. If this is on a single page, then it looks unprofessional. If it's 5 or 6 throughout the entire manuscript, then this is reasonable and to be expected. Keep track of these and make the changes as part of your revision once the paper comes back from the reviewers. In your reply to the reviewers, just mention "During revision, I have also taken the liberty to fix a small number of typos and grammar errors that had unfortunately made their way into the original manuscript".