Unique rules when forming that grammar are highlighted like this.
Example sentences follow these rules too!
Joining and Nesting Markers:
Verb[た/る] - means that dictionary form and ta form are accepted.
Verb[causative[て]] - means て form of the causative form of the verb.
といったらない is a set expression used to highlight the very high extent of something (like being amazed, surprised and so on), to the point of not being able to describe it with mere words. Can be used in both - positive and negative contexts. ったらない is the more casual variant.