Here's a screenshot of Leopard requiring a restart for an update:

http://i.kinja-img.com/gawker-media/image/upload/s--L-qfNFHD...

Here's one for Snow Leopard:

http://cdn.osxdaily.com/wp-content/uploads/2010/03/mac-os-x-...

Lion:

http://cdn.cultofmac.com/wp-content/uploads/2012/02/Screen-S...

And just in case you think this was real but you got the era wrong, here's a screenshot of 10.3 requiring a restart for all sorts of updates, including a Safari update and a Daylight Saving Time update:

https://systemfolder.files.wordpress.com/2011/07/softupdpant...

Plus a normal OS update:

http://sillydog.org/graph/temp/ss_swupdate01.jpg