diff --git a/lessons/3-first-sprite.md b/lessons/3-first-sprite.md
index 24b2150..cbf14de 100644
--- a/lessons/3-first-sprite.md
+++ b/lessons/3-first-sprite.md
@@ -67,5 +67,5 @@ What if I don't like how big it is?
 
     image = image.load("player.png")
     scaled_image = smoothscale(image,
-                               (image.get_width() * 0.5,
-                                image.get_height() * 0.5))
+                               ( int(image.get_width() * 0.5),
+                                 int(image.get_height() * 0.5)) )
diff --git a/lessons/6-enemies.md b/lessons/6-enemies.md
index edf20ab..be9407c 100644
--- a/lessons/6-enemies.md
+++ b/lessons/6-enemies.md
@@ -48,6 +48,7 @@ Let's make some collisions!
             enemies = self.groups["enemy"]
             groupcollide(player, enemies, True, True)
             groupcollide(enemies, bullets, True, True)
+            self.spawner.spawn(time_delta)
 
 `groupcollide` takes two sprite groups and checks every sprite inside
 against each other. The two booleans are telling group collide to kill
diff --git a/lessons/7-spawning.md b/lessons/7-spawning.md
index a204419..1d2a2be 100644
--- a/lessons/7-spawning.md
+++ b/lessons/7-spawning.md
@@ -27,7 +27,7 @@ So let's make a spawner!
 
         def prime(self):
             try:
-                self.next_spawn, self.next_position = next(self.generator)
+                self.next_time, self.next_position = next(self.generator)
             except StopIteration:
                 self.running = False
 
@@ -65,12 +65,14 @@ Make a file called `spawn.csv` and let's populate it:
 
 Now we'll make a new generator:
 
+    import csv
+
     def file_spawner(file_name):
         with open(path.join(path.dirname(__file__), file_name), "r") as spawn_file:
-            spawn_reader = csv.reader(csvfile)
+            spawn_reader = csv.reader(spawn_file)
             for row in spawn_reader:
                 yield float(row[0]), int(row[1])
 
 Then replace our simple spawner with this.
 
-    self.spawner = Spawner(self, file_spawner('spawn.csv'), Enemy)
\ No newline at end of file
+    self.spawner = Spawner(self, file_spawner('spawn.csv'), Enemy)