eachの引数の関数でfalseを返すとbreakの代わりと見なされるのでfalse以外の値を返しますよ

ぴょんぴょん

$ ->
  include '/jQuery.cookie.js'
  checkList = []

  updateControl = ->
    $('#save-anime').attr 'disabled', true
    link = "http://akouryy.net/anime/?year=2014&season=3&by_param"
    console.log checkList
    $('.show-anime').each (i) ->
      if $(this).is ':checked'
        $("[data-anime=\"#{$(this).attr 'data-anime-for'}\"]").show 0
        link += "&#{encodeURI $(this).attr 'data-anime-for'}"
      else
        $("[data-anime=\"#{$(this).attr 'data-anime-for'}\"]").hide 0
      if checkList[i] != $(this).is ':checked'
        $('#save-anime').attr 'disabled', false
    $('#share-link').val link
    $('.twitter-share-button').attr 'data-url', link

    `!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs')`

  $('.week-style.all-week').click ->
    $('.week-style.all-week').addClass 'selected'
    $('.week-style.each-week').removeClass 'selected'
    $('.anime-timetable.all-week').show 0
    $('.anime-timetable.each-week').hide 0

  $('.week-style.each-week').click ->
    $('.week-style.all-week').removeClass 'selected'
    $('.week-style.each-week').addClass 'selected'
    $('.anime-timetable.all-week').hide 0
    $('.anime-timetable.each-week').show 0

  ###
  $ '.select-anime'
    .change ->
      if $(this).is ':checked'
        $ "[data-anime=\"#{$(this).attr 'data-anime-for'}\"]"
          .addClass 'highlighted'
      else
        $ "[data-anime=\"#{$(this).attr 'data-anime-for'}\"]"
          .removeClass 'highlighted'
  ###

  $('.show-anime').change ->
    updateControl()

  $('#save-anime').click ->
    $('.show-anime').each (i) ->
      $.cookie $(this).attr('data-anime-for'), $(this).is ':checked'
      checkList[i] = $(this).is ':checked'
      'DO NOT BREAK'
    location.href = "http://akouryy.net/anime/?year=2014&season=3"

  $('.show-anime').each (i) ->
    s = $.cookie $(this).attr 'data-anime-for'
    checkList[i] = if s? then s == "true" else $(this).attr('data-show-default') == "true"
    unless $(this).attr 'data-fixed'
      $(this).attr 'checked', checkList[i]
    'DO NOT BREAK'
  $('.week-style.all-week').click()
  updateControl()