Prevent iOS (and maybe other mobile OSs as well) from auto capitalizing your username field, which in a standard Django auth setup would prevent these people from signing up with their uncapitalized username (or email for custom backends) when they try to login later.

forms.py

class LoginForm(AuthenticationForm):
    """ Subclass the default AuthenticationForm and overwrite the username widget attributes """

    def __init__(self, *args, **kwargs):
        super(LoginForm, self).__init__(*args, **kwargs)
        self.fields['username'].widget.attrs.update({'autocapitalize':'off', 'autocorrect': 'off'})