I am not sure if that is what OP meant, but I came across this question because I was searching for a list of issues I have to keep in mind when migrating from Underscore.js to Lodash.
I would really appreciate if someone posted an article with a complete list of such differences. Let me start with the things I've learned the hard way (that is, things which made my code explode on production:/):
_.flatten in Underscore.js is deep by default, and you have to pass true as second argument to make it shallow. In Lodash it is shallow by default and passing true as second argument will make it deep! :)_.last in Underscore.js accepts a second argument which tells how many elements you want. In Lodash there is no such option. You can emulate this with .slice_.first (same issue)_.template in Underscore.js can be used in many ways, one of which is providing the template string and data and getting HTML back (or at least that's how it worked some time ago). In Lodash you receive a function which you should then feed with the data._(something).map(foo) works in Underscore.js, but in Lodash I had to rewrite it to _.map(something,foo). Perhaps that was just a TypeScript-issue.
