Use the instructions box to your advantage
You'll notice that each time you submit an order you have the opportunity to attach "Special Instructions." Plenty of pizza-loving people have used it for wondrous and weird requests, but it can also serve as a de-facto comment box, appealing to the good nature of those hardworking employees who put the finishing touches on your chicken tikka masala. So, before you check out next time, try laying on the compliments and/or gracious thanks -- it’ll at least make the person on the receiving end feel a little better about their day, and could very well result in them tossing in a couple free samosas.
Score free meals using referral codes
Hopefully you're not the type to spam your friends with obnoxious referral emails, but FYI every new person you get to sign up will score you $7 to put towards your own order. Of course, most of your friends are probably already knee-deep in Seamless delivery as it is, so you may actually have better luck Googling "Seamless coupons,” which oftentimes dredges up time-sensitive discount codes worth trying out at checkout.