DB and Update Script errors reported on upgrading module

Using:

• Drupal 5.1
• MySQL 5.0.22

After upgrading the module and running the update.php script, got the following errors:

    * warning: array_merge() [function.array-merge]: Argument #2 is not an array in /www/cw-drupal/drupal-5/update.php on line 309.
    * user warning: BLOB/TEXT column 'url' used in key specification without a key length query: ALTER TABLE chinwag_simplefeed_feed_item CHANGE url url text in /www/cw-drupal/drupal-5/includes/database.mysql.inc on line 172.
    * warning: Invalid argument supplied for foreach() in /www/cw-drupal/drupal-5/update.php on line 540.

So far, this doesn't appear to have affected the operation of Simplefeed, but I'm keeping a close eye on it. The DB upgrade did work i.e. type has been changed from varchar(255) to text.

Didn't see this reported as an issue elsewhere, so thought I ought to mention it just in case.